Machine for making mica sheets



(No Model.)

B GENGENBAGH MACHINE FOR MAKING MIGA SHEETS.

Patented Apr. 4 1893'.

INVENTOH WITNESSES.

' aw/m s PETERS m We .U S TES "rarer.

EUGENE GENGENBAOH, OF SOHENEOTADY, NEW YORK.

MACHINE FOR MAKING MICA SHEETS.

SPECIFICATION forming part of Letters Patent No. 494,714, dated April 4,1893.

Application filed September 23, 1892. Serial No. 446.695- (No model.)

. To all whom it may concern.-

Be it known that I, EUGENE GENGENBAOH, a citizen of the United States,and a resident of Schenectady, in the county of Schenectady, in theState of New York, have invented certain new and useful Improvements inMachines for Making Mica Sheets, of which the following is aspecification.

This invention relates to a new and improved machine for makingmicasheets to be used for insulating purposes in dynamos,electro-motors, 850., out of pieces of mica of V3.- rious sizes; and theinvention consists in the combination with a drum, of an endlessconveyer belt resting against the part of the same, means for feedingmica upon said belt and means for applying varnish or a similar adhesivesubstance to the face of the drum, whereby when the drum rotates thepieces of mica are pressed by the belt against the layer of varnish onthe drum, whereby a layer of greater or less thickness of mica andvarnish is produced on the surface of the drum, which layer can be outoff in pieces of any desired size. 7

In the accompanying drawings, Figure 1 is a vertical transversesectional view of my improved machine for making mica sheets, and Fig. 2is an enlarged sectional View of part of one of the sheets.

Similar letters of reference indicate corresponding parts.

The drum A, which may be made of wood or metal in any desired manner andmay be of any suitable diameter, is suitably mounted in a frame, shownin dotted lines-and against part of the same an endless beltB ispressed, which passes over the guide-rollers O O O O. A rotary brush Dis arranged parallel with and adjacent to the drum A and is suppliedwith varnish or any like adhesive substance from the trough orreceptacle E above the same. A scraper F is arranged above the brush, sothat the bristles of the brush strike against the upper edge of saidscraper. As the brush D rotates the bristles are arrested for a shorttime by the scraper F and squirt or eject the particles of varnish uponthe surface of the drum.

Above the belt 13 a receptacle H for pieces of mica is arranged, whichreceptacle contains a suitable agitator J. The pieces of mica drop fromthe bottom of the receptacle H upon the belt B, which travels in thedirection indicated by the arrows, and said belt presses the pieces ofmica against the varnished face of the drum or the varnished faces ofthe pieces of mica that have been previously applied. For eachrevolution of the roller a fresh coat of varnish it applied, andimmediately after the varnish has been applied pieces of mica areapplied.

The feeding device or receptacle or hopper H is so arranged as to feedthe pieces of mica at the proper speed. If desired, the feeding devicemay be omitted and the pieces of mica placed on the belt by hand.

At the bottom of a belt B a scraper or doctor K is arranged, whichscrapes the surplus varnish from the belt and conducts the same into avessel L.

At that side of the roller opposite the one at which the brush D isarranged one or more rollers M are arranged parallel with the drum A andare pressed against the same by springs N in the supports of saidrollers. Said rollers M are heated by steam conducted to the same bypipes 0 connected with the main steam-pipe P. In place of steam, hot aircan be used. The heated rollers M press the several layers of micafirmly against each other and evaporate the varnish that is not requiredfor causing the pieces of mica to hold firmly to each other. The machinecontinues to run in this manner until a layer of desired thickness ofmica and varnish is obtained on the drum A, and then this layer is cutinto strips and pieces of the desired length and shape and removed fromthe roller to be used for insulating purposes in the usual manner.Plates and sheets composed of mica pieces can thus be made in anydesired'size and cut into any desired shape, and can be produced at avery low cost, as the smallest pieces of mica such as are usuallywasted, can be used on this improved machine. Cylinders of mica orsegmental pieces can also be made on this machine by removing the drumand slipping the cylinder formed off the same and cutting the same intopieces of the desired size.

Having ,thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a machine for making mica sheets, the

combination, with a rotative drum, of means for applying an adhesivesubstance on the face of said drum, an endless belt in contact with thepart of said drum, and means for feeding pieces of mica upon said belt,substantially as set forth.

2. In a machine for making mica sheets, the combination, with a rotativedrum, of an endless belt in contact with part of said drum, means forapplying an adhesive substance on the surface of said drum, rollerspressed against the surfaces of the drum, and means for heating saidrollers, substantially as setforth.

3. In a machine for making mica sheets, the

